30 CFR 57.6406 - Duration of current flow.

§ 57.6406 Duration of current flow.

If any part of a blast is connected in parallel and is to be initiated from powerlines or lighting circuits, the time of current flow shall be limited to a maximum of 25 milliseconds. This can be accomplished by incorporating an arcing control device in the blasting circuit or by interrupting the circuit with an explosive device attached to one or both lead lines and initiated by a 25-millisecond delay electric detonator.

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

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United States Code

Title 30 published on 11-Aug-2017 03:29

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 30 CFR Part 57 after this date.

  • 2017-09-12; vol. 82 # 175 - Tuesday, September 12, 2017
    1. 82 FR 42757 - Examinations of Working Places in Metal and Nonmetal Mines
      GPO FDSys XML | Text
      DEPARTMENT OF LABOR, Mine Safety and Health Administration
      Proposed rule; delay of effective date.
      Comments must be received or postmarked by midnight Eastern Daylight Saving Time (DST) on September 26, 2017.
      30 CFR Parts 56 and 57